I bring in polygon as Shapefiles and they display, I can select, all looks well. However the toggle edit is ALWAYS greyed out. If I make a new layer with features in it, the toggle edit is fine. This is with any shapefile.

I've tried from three different sources. I am very frustrated as I need toggle edit to merge polygons (and it seems many other things)

1 Answer
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I have found this to be the case for .shp files exported from AutoCAD - to get around this, I export the shape file again as a shape file from QGIS (right click on the layer item, save as...). After this, all is well.

Another way to get around it is to copy all the features from your layers to a new one that you have created - there you can do all the edits you want; however that could destroy some data in the attribute fields, if you care like about that.